191995513492 has 12 divisors (see below), whose sum is σ = 347578084980. Its totient is φ = 92687489216.

The previous prime is 191995513481. The next prime is 191995513511. The reversal of 191995513492 is 294315599191.

It can be written as a sum of positive squares in 2 ways, for example, as 35151000196 + 156844513296 = 187486^2 + 396036^2 .

It is a Harshad number since it is a multiple of its sum of digits (58).

It is a congruent number.

It is an unprimeable number.

It is a polite number, since it can be written in 3 ways as a sum of consecutive naturals, for example, 827566753 + ... + 827566984.

It is an arithmetic number, because the mean of its divisors is an integer number (28964840415).

Almost surely, 2^191995513492 is an apocalyptic number.

It is an amenable number.

191995513492 is a deficient number, since it is larger than the sum of its proper divisors (155582571488).

191995513492 is a wasteful number, since it uses less digits than its factorization.

191995513492 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1655133770 (or 1655133768 counting only the distinct ones).

The product of its digits is 3936600, while the sum is 58.

The spelling of 191995513492 in words is "one hundred ninety-one billion, nine hundred ninety-five million, five hundred thirteen thousand, four hundred ninety-two".